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NET INCOME PER SHARE Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 15, 2015
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]      
Anti-dilutive potential common shares (in thousands of shares) 5,267 5,099  
Options      
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]      
Anti-dilutive potential common shares (in thousands of shares) 2,654 4,313  
Non-vested restricted stock units      
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]      
Anti-dilutive potential common shares (in thousands of shares) 2,613 786  
Convertible Debt [Member]      
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]      
Long-term Debt, Gross     $ 125.0
Debt Instrument, Interest Rate, Stated Percentage     2.00%